LeetCode 257: Binary Tree Paths Solution
Master LeetCode problem 257 (Binary Tree Paths), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
257. Binary Tree Paths
Problem Explanation
Explanation:
To solve this problem, we can use a depth-first search (DFS) approach to traverse the binary tree and keep track of the current path from the root to the leaf nodes. We recursively explore each node, appending the node's value to the current path. When we reach a leaf node, we add the current path to the result list of paths. :
Solution Code
class Solution {
public List<String> binaryTreePaths(TreeNode root) {
List<String> paths = new ArrayList<>();
if (root == null) {
return paths;
}
dfs(root, "", paths);
return paths;
}
private void dfs(TreeNode node, String path, List<String> paths) {
if (node == null) {
return;
}
if (path.isEmpty()) {
path += node.val;
} else {
path += "->" + node.val;
}
if (node.left == null && node.right == null) {
paths.add(path);
} else {
dfs(node.left, path, paths);
dfs(node.right, path, paths);
}
}
}Try It Yourself
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